CVE-2026-32740

Summary

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1×4 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0.

Affected Software

Weaknesses

• CWE-787: CWE-787: Out-of-bounds Write

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

libheif: libheif: Arbitrary code execution or denial of service via crafted HEIF/AVIF file

Additional References

• https://access.redhat.com/security/cve/CVE-2026-32740
• https://bugzilla.redhat.com/show_bug.cgi?id=2479969
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32740.json

References

• https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j
• https://github.com/strukturag/libheif/releases/tag/v1.22.0

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